YOKOGAWA TB400G-A1 Series, User Manual, Page: 54 / 140

<4. OPERATION>
4-5
IM 12E04A02-02E
a. Without Automatic Zero Calibration (Suf fi x code: -A2)
Automatic cleaning can be started in the following two ways:
• Startup with the internal timer
• Startup with FUNCTION “6” in the <MAINT.> mode (see Section 6.5).
Note: Startup with the internal timer can be selected for execution (on)/stop (off) using
FUNCTION “A.” in the <PROGRAM1> mode. It has been set to execute (on) when
shipped from the factory.
The internal timer operation is shown below. The automatic-cleaning operation is repeated at
every preset time of the cleaning period (A) (Figure 4.5).
A A A A A
Cleaning Cleaning Cleaning Cleaning Cleaning Cleaning
A
Measurement start *1
*1: Measurement start is defined to be the point specified in the following:
Other mode <MEAS.> mode
Power off Power on (<MEAS.> mode)
F0405.ai
Figure 4.5 Cleaning Period
Figure 4.6 shows tha automatic-cleaning operation time chart and Table 4.2 the list of settings for
automatic cleaning.
<Valve used>
SV1: Drain valve
SV2: Cleaning water valve
<Time chart>
Example: N (number of cleaning repetitions) = 4
F0406.ai
*1 During cleaning, the output is always in the hold state.
The display is also set to be held using FUNCTION "8." in the <PROGRAM1> mode.
Contact outputs C1 and C2 can be used as contacts for the period during cleaning and
calibration. This is set using FUNCTION "E." in the <PROGRAM1> mode.
Note 1: N: Number of cleaning repeats
Note 2: One automatic cleaning cycle = N (cl dr water filling) + relaxation
SV1
(Drain)
OFF
OFF
N =
ON
1 2 3 4
ON
OFF
HOLD HOLD ON
Power on
Measurement
start
Cleaning cycle
Cleaning time 1
One cleaning cycle
Recovery time
Drain time 1
Water fill time 1
SV2
(Cleaning)
Output
holding *1
Figure 4.6 Automatic-cleaning Operation Time Chart (Suf fi x code: -A2)
3rd Edition : May. 31, 2010-00